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Diffstat (limited to 'sound/soc/bcm/bcm2835-i2s.c')
-rw-r--r--sound/soc/bcm/bcm2835-i2s.c27
1 files changed, 24 insertions, 3 deletions
diff --git a/sound/soc/bcm/bcm2835-i2s.c b/sound/soc/bcm/bcm2835-i2s.c
index 1c1f22103..6ba204982 100644
--- a/sound/soc/bcm/bcm2835-i2s.c
+++ b/sound/soc/bcm/bcm2835-i2s.c
@@ -259,6 +259,9 @@ static int bcm2835_i2s_hw_params(struct snd_pcm_substream *substream,
case SNDRV_PCM_FORMAT_S16_LE:
data_length = 16;
break;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ data_length = 24;
+ break;
case SNDRV_PCM_FORMAT_S32_LE:
data_length = 32;
break;
@@ -273,13 +276,20 @@ static int bcm2835_i2s_hw_params(struct snd_pcm_substream *substream,
/* otherwise calculate a fitting block ratio */
bclk_ratio = 2 * data_length;
- /* set target clock rate*/
- clk_set_rate(dev->clk, sampling_rate * bclk_ratio);
+ /* Clock should only be set up here if CPU is clock master */
+ switch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBS_CFS:
+ case SND_SOC_DAIFMT_CBS_CFM:
+ clk_set_rate(dev->clk, sampling_rate * bclk_ratio);
+ break;
+ default:
+ break;
+ }
/* Setup the frame format */
format = BCM2835_I2S_CHEN;
- if (data_length > 24)
+ if (data_length >= 24)
format |= BCM2835_I2S_CHWEX;
format |= BCM2835_I2S_CHWID((data_length-8)&0xf);
@@ -570,6 +580,7 @@ static struct snd_soc_dai_driver bcm2835_i2s_dai = {
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S16_LE
+ | SNDRV_PCM_FMTBIT_S24_LE
| SNDRV_PCM_FMTBIT_S32_LE
},
.capture = {
@@ -577,6 +588,7 @@ static struct snd_soc_dai_driver bcm2835_i2s_dai = {
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S16_LE
+ | SNDRV_PCM_FMTBIT_S24_LE
| SNDRV_PCM_FMTBIT_S32_LE
},
.ops = &bcm2835_i2s_dai_ops,
@@ -678,6 +690,15 @@ static int bcm2835_i2s_probe(struct platform_device *pdev)
dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].maxburst = 2;
dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].maxburst = 2;
+ /*
+ * Set the PACK flag to enable S16_LE support (2 S16_LE values
+ * packed into 32-bit transfers).
+ */
+ dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].flags =
+ SND_DMAENGINE_PCM_DAI_FLAG_PACK;
+ dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].flags =
+ SND_DMAENGINE_PCM_DAI_FLAG_PACK;
+
/* BCLK ratio - use default */
dev->bclk_ratio = 0;